package _2工具类;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.naming.spi.DirectoryManager;

public class DbUtils {
	final static String URL = "jdbc:mysql://localhost:3306/mydb";
	final static String USERNAME = "root";
	final static String PASSWORD = "123456";

	static {
		// 加载驱动
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (ClassNotFoundException e) {
			// TODO: handle exception
			System.out.println("没有找到驱动，检查是否有添加mysql驱动jar包");
		}
	}

	/**
	 * 获取连接
	 * 
	 * @return 返回一个连接
	 * @throws SQLException
	 */
	public static Connection getConnection() throws SQLException {
		Connection conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
		return conn;
	}

	/**
	 * 释放资源
	 * 
	 * @param conn
	 * @param stmt
	 * @param rs
	 */
	public static void destoryResource(Connection conn, Statement stmt, ResultSet rs) {
		if (rs != null) {
			try {
				rs.close();
			} catch (SQLException e) {
				// TODO: handle exception
				e.printStackTrace();
			}
		}
		if (stmt != null) {
			try {
				stmt.close();
			} catch (SQLException e) {
				// TODO: handle exception
				e.printStackTrace();
			}
		}
		if (conn != null) {
			try {
				conn.close();
			} catch (SQLException e) {
				// TODO: handle exception
				e.printStackTrace();
			}
		}

	}

}
